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LAMMA 2021

LAMMA 2021

Fungicide stewardship advice updated following loss of CTL

In response to withdrawal of the multisite fungicide, chlorothalonil on May 20, the Fungicide Resistance Action Group (FRAG) has updated its fungicide resistance stewardship advice.

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The use of low resistance risk multisite chemistry to reduce selection pressure on higher resistance risk fungicides is an important component of anti-resistance management strategies.

 

The withdrawal of chlorothalonil on the May 20 removes this active ingredient from the options available, says FRAG.

 

“Chlorothalonil was an important component of anti-resistance management strategies, particularly when used as part of control of septoria leaf blotch.”


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However, the principle of using the lowest resistance risk options and limiting the use of higher-risk options within fungicide programmes remains core to resistance management advice, it adds.

 

“Although other multisite fungicides are not as effective as chlorothalonil against septoria leaf blotch and carry some additional cost, the inclusion of lower resistance risk chemistry – such as the multisite fungicides folpet and mancozeb – is still useful in reducing reliance on other higher-risk chemistry.”

 

The use of multisite fungicides such as folpet and mancozeb within label recommendations on maximum dose, application number and timing will reduce pressure on higher-risk chemistry, says FRAG.

 

“Given lower levels of efficacy compared to chlorothalonil, the rates of folpet or mancozeb should be kept high to maximise their efficacy. Note, mancozeb is not approved for use in barley. Take care to stay within label limits for both actives.”

Core principles of resistance management

  • Use cultural and agronomic measures e.g. resistant varieties and late drilling to reduce disease risk and reliance on fungicides in programmes
  • Alternate and diversify the chemistry used in programmes
  • Use balanced mixtures of chemistry in programmes
  • Minimise the use of high resistance risk chemistry and maximise the use of lower-risk options in programmes
  • Include multisite fungicides, which are categorised as low-resistance risk

Source: FRAG

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